Today I enlisted the services of "PaulTheWelder" from M3Cutters to do the "2 pipe" mod to my OEM backbox. The mod involves opening up the stock backbox which reveals 4 perforated pipes, two of these are wrapped up using exhaust tape and some other fiberglass thing, then the insulation is put back in place and the exhaust is welded back up again.
The car now sounds like it should have done when leaving the factory. It's perfectly civilized when driving normally (albeit a bit louder), and lets the heavens open at WOT. The downshift from 3 > 2 is brutal now, I enjoyed being a complete knob today and making people jump with it
Video shall come shortly.